[求助] 编译成功后，EXCECUTE_ON_DEMAND时出现FLUENT received fatal signal

本菜鸟刚接触fluent不久，现在做一个方柱绕流的计算，想通过udf提取出每一步方柱表面的压力分布，但是compile成功后，在迭代之前调出EXECUTE_ON_DEMAND是却出现这个错误， FLUENT received fatal signal (ACCESS_VIOLATION) 1. Note exact events leading to error. 2. Save case/data under new name. 3. Exit program and restart to continue. 4. Report error to your distributor. 搜了很长时间并没有找到错误的根源，希望哪位师兄师姐帮忙看一下，非常感谢！ 下边是源代码： #include "udf.h" DEFINE_ON_DEMAND(surfacepressure) { FILE *fp; real A[2]; real p; real x; real y; face_t f; Domain *d=Get_Domain(8);          Thread *wall=Lookup_Thread(d,14);    fp=fopen("surface pressure.txt","w"; begin_f_loop(f,wall)                        {         p=F_P(f,wall);         F_CENTROID(A,f,wall);         x=A[0];         y=A[1];     fprintf(fp,"f,x=%g,y=%g,p=%g\n",f,x,y,p);      } end_f_loop(f,wall) fprintf(fp,"step=%g\n",N_ITER);     /*get current iteration number*/ fclose(fp); }

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